Method and means for removing carbon deposits



TE S'FATEfi serene? orrice no e. mm m mom 2.

om IOI'OBS mum non or nmwmn application relates to the removal of carbon deposits from the combustion chamhers of internal combustion engines, and its principal objects are to employ compounds particularly suitahle for this purpose ands process adapted to employ these compounds at their highest efficiency.

We have found that nitromethane particularly useful in removing carbon deposits and that the best method of it is to apply it to carbon coated parts which have been heated preferably to a temperature above 150 F., the optimum conditions for water cooled engines being at approximately the boiling point of water. We may also use with nitromethane a mixture of benzol and alcohol, or other low varnish remover, which apparently increases the solvent action of mtromethane not only by reducing the viscosity, but also because they are lower boiling and tend to keep the liquid in contact with the carbon in a mild state of agitation.

As a specific example we may use in each be cylinder of an ordinary six cylinder engine 34] c. c. of a mixture comprising by volume 40 arts of nitromethane, 30 parts of benzol, an 30 parts of ethyl alcohol. The engine is operated until the temperature of the metal parts of the combustion chamber is at least 15 0 F. when the mixture is injected or otherwise introduced into the cylinders and the engine stopped. The mixture is permitted to remain in the cylinders for about two hours more or less, depending upon the nature of the ccrhon deposit, during which time the gummy binder is softened or dissolved. Then the on no is started and the loosened deposit is gradiially blown out the exham.

The proportion may be changed to suit specific conditions and the nitromethane may used alone.

When cleaning the parts by hand they may he heated, the solvent applied, and when the hifnder is softened the deposit may be wiped o BOYD, OF DETROIT, CORPORATION, 03 DETROIT, MICHIGAN, L CORPORA- IIHGHIGAE', ASSIGHOBS TG DEEOSITS comhustion engine which comprises heating the coated parts to above 150 F., applying to the carbon deposit nitromethune. benzol and alcohol, and removing the carbon deposit.

4. A composition of matter for removing carbon deposits: from internal combustion engines comprising nitromethane and a low iling varnish remover.

5. A composition of matter for removing carbon deposits from internal combustion engines comprising nitroznethane, benzol and alcohol.

In testimony whereof we affix our signatures.

ELER LOVELL. THUMAS A. BOYD. 

